{ flake
, flakeAttr
, diskMappings
, extraSystemConfig ? "{}"
, writeEfiBootEntries ? false
, rootMountPoint ? "/mnt"
,
}:
let
  originalSystem = (builtins.getFlake "${flake}").nixosConfigurations."${flakeAttr}";
  lib = originalSystem.pkgs.lib;

  deviceName =
    name:
    if diskMappings ? ${name} then
      diskMappings.${name}
    else
      throw "No device passed for disk '${name}'. Pass `--disk ${name} /dev/name` via commandline";

  modifiedDisks = builtins.mapAttrs
    (
      name: value:
        let
          dev = deviceName name;
        in
        value
        // {
          device = dev;
          content = value.content // {
            device = dev;
          };
        }
    )
    originalSystem.config.disko.devices.disk;

  # filter all nixos module internal attributes
  cleanedDisks = lib.filterAttrsRecursive (n: _: !lib.hasPrefix "_" n) modifiedDisks;

  diskoSystem = originalSystem.extendModules {
    modules = [
      {
        disko.rootMountPoint = rootMountPoint;
        disko.devices.disk = lib.mkVMOverride cleanedDisks;
      }
    ];
  };

  installSystem = originalSystem.extendModules {
    modules = [
      (
        { lib, ... }:
        {
          boot.loader.efi.canTouchEfiVariables = lib.mkVMOverride writeEfiBootEntries;
          boot.loader.grub.devices = lib.mkVMOverride diskoSystem.config.boot.loader.grub.devices;
          imports = [
            ({ _file = "disko-install --system-config"; } // (builtins.fromJSON extraSystemConfig))
          ];
        }
      )
    ];
  };
in
{
  installToplevel = installSystem.config.system.build.toplevel;
  closureInfo = installSystem.pkgs.closureInfo {
    rootPaths = [ installSystem.config.system.build.toplevel ];
  };
  inherit (diskoSystem.config.system.build) formatScript mountScript diskoScript;
}